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DiY LEDs - How to Power Them

Discussion in 'LED and other Lighting' started by SupraSPL, Feb 22, 2014.

  1.  
    Dopaw13

    Dopaw13 Well-Known Member

    yeah i was just going to use different drivers but after i saw a few of Growmau5 you tube vids i think i am trying to get to advanced with it but if i am going to do it i wana do it right
     
    Abiqua likes this.
  2.  
    bleak

    bleak Member

    Hi! I'm working on a new setup and have a Meanwell APV-12-12 to power 2 CPU fans.

    What is the best (meaning safest and most reliable) way to connect the APV-12-12 to the mains? I have some AC adapters laying around, but I don't know if they're suitable. Could someone more knowledgeable let me know if any of these adapters will work?

    1. Motorola adapter - output 3.6v 600mA
    2. Achme adapter - output 5v 3.0A
    3. Nokia adapter - output 5.3v 500mA
     
  3.  
    The Dawg

    The Dawg Well-Known Member

    No Adapters Are Needed. Just Use A 2 Wire Power Cord From An Old Lamp :hump:
    https://www.1000bulbs.com/product/1...MI-aXYm4zQ1wIVkoJpCh0z6w5qEAQYASABEgJXCvD_BwE
     
    bleak and Dopaw13 like this.
  4.  
    bleak

    bleak Member

    Thanks Dawg! If I use a normal 2-wire power cord, I'm aware I need to be careful, as it'll be carrying the full power from the mains (220 volt in my country)

    Is there a safety advantage to using an AC adapter? In other words, if I'm stupid enough to somehow zap myself - Won't the AC adapter just give me a 'slap on the wrist' in comparison to the 2-wire power cord which could kill me?
     
  5.  
    GBAUTO

    GBAUTO Well-Known Member

    The APV is the same thing as the AC adapters you have. It converts AC line voltage to 12VDC rather than the 3~5V the smaller adapters output. The only additional hazard is that you need to direct wire it to a plug or bus bar rather than plugging it into an outlet.
     
    bleak likes this.
  6.  
    bleak

    bleak Member

    Thanks Gbauto, that makes total sense. I'll be careful connecting the APV-12-12 to mains power!
     
  7.  
    Delta-9Pyromaniac

    Delta-9Pyromaniac Well-Known Member

    HydroRed likes this.
  8.  
    HydroRed

    HydroRed Well-Known Member

  9.  
    Delta-9Pyromaniac

    Delta-9Pyromaniac Well-Known Member

    I don't understand. can you please explain
     
  10.  
    HydroRed

    HydroRed Well-Known Member


    Specs shows them as running off of AC 220V. Thats quite the electrical supply for a 50W led light (advertised 500-999 lumens).
     
    Delta-9Pyromaniac likes this.
  11.  
    ANC

    ANC Well-Known Member

    At least the LED drivers are more efficient at 220V
     
    Delta-9Pyromaniac likes this.
  12.  
    HydroRed

    HydroRed Well-Known Member

    True, but I cant see using up a 220V source for a 50W led light. Seems absurd. I have a single 220V source on my property and its for a 5000W heater.
     
    Delta-9Pyromaniac likes this.
  13.  
    ANC

    ANC Well-Known Member

    Voltage doesn't mean shit without current.
    5000W heater at 220V is 23A (would be 46A on 110V requiring seriously thick wire.
    Voltage is only the potential, power is potential times current.
    SO the only difference is, on the mains side, 220V draws half the current 110V does.
     
    Delta-9Pyromaniac likes this.
  14.  
    HydroRed

    HydroRed Well-Known Member

    So would you eat up a 220V recepticle for one of those 50W led lights he put a link up for? Thats the point I was making. Like I said...absurd.
     
    Delta-9Pyromaniac likes this.
  15.  
    ANC

    ANC Well-Known Member

    If he isn't doing something else with the outlet, why not, it makes no difference in the power consumed.

    I live in the 220V world, have things like 3W LED bulbs connected to it.
     
    Delta-9Pyromaniac likes this.
  16.  
    TheHero

    TheHero Member

    If a required voltage is 220V, it probably takes all amps it can run it at full, so if its 50w, it is going to eat 0.2 amps from wall.
    Bacis electrics. voltage(V) x amps(A) = power (watts). And from this You can understand that this LED has 1100 ohm resistance. I = U/R
     
    Delta-9Pyromaniac likes this.
  17.  
    Delta-9Pyromaniac

    Delta-9Pyromaniac Well-Known Member

    Would I be able to wire all four of those driverless LED's together with four fans and a driver to make one fixture? Safely?
     
  18.  
    HydroRed

    HydroRed Well-Known Member

    Just curious, but are you planning to run them on a 220v receptacle?
     
    Delta-9Pyromaniac likes this.
  19.  
    Growdad54

    Growdad54 Member

     
  20.  
    ANC

    ANC Well-Known Member

    They have a resistance that changes with temperature, which is why we use constant current drivers, or the COBs would get warmer and warmer and the resistance it offers less and less,
    No, damn my vocabulary is taking a smoke break right now.
    You need to galvanicly isolate the power supply from the wall before it goes to your LED. this can be done digitally for small currents or through a 1:1 transformer if you want to brute force it.
    Maybe you can run it through a UPS.

    https://www.jameco.com/shop/keyword=1:1-Isolation-Transformer

    If you go the transformer route, efficiency goes right out the window.
     
    Delta-9Pyromaniac likes this.

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